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path: root/formats/packp/pktline/pktlines.go
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-rw-r--r--formats/packp/pktline/pktlines.go140
1 files changed, 0 insertions, 140 deletions
diff --git a/formats/packp/pktline/pktlines.go b/formats/packp/pktline/pktlines.go
deleted file mode 100644
index c19aa2e..0000000
--- a/formats/packp/pktline/pktlines.go
+++ /dev/null
@@ -1,140 +0,0 @@
-// Package pktline implements reading payloads form pkt-lines and creating pkt-lines from payloads.
-package pktline
-
-import (
- "bytes"
- "errors"
- "io"
- "strings"
-)
-
-const (
- // MaxPayloadSize is the maximum payload size of a pkt-line in bytes.
- MaxPayloadSize = 65516
-)
-
-var (
- flush = []byte{'0', '0', '0', '0'}
-)
-
-// PktLines values represent a succession of pkt-lines. Values from
-// this type are not zero-value safe, use the New function instead.
-type PktLines struct {
- r io.Reader
-}
-
-var (
- // ErrPayloadTooLong is returned by the Add methods when any of the
- // provided payloads is bigger than MaxPayloadSize.
- ErrPayloadTooLong = errors.New("payload is too long")
- // ErrEmptyPayload is returned by the Add methods when an empty
- // payload is provided.
- ErrEmptyPayload = errors.New("cannot add empty payloads")
-)
-
-// New returns an empty PktLines (with no payloads) ready to be used.
-func New() *PktLines {
- return &PktLines{
- r: bytes.NewReader(nil),
- }
-}
-
-// AddFlush adds a flush-pkt to p.
-func (p *PktLines) AddFlush() {
- p.r = io.MultiReader(p.r, bytes.NewReader(flush))
-}
-
-// Add adds the slices in pp as the payloads of a
-// corresponding number of pktlines.
-func (p *PktLines) Add(pp ...[]byte) error {
- tmp := []io.Reader{p.r}
- for _, p := range pp {
- if err := add(&tmp, p); err != nil {
- return err
- }
- }
- p.r = io.MultiReader(tmp...)
-
- return nil
-}
-
-func add(dst *[]io.Reader, e []byte) error {
- if err := checkPayloadLength(len(e)); err != nil {
- return err
- }
-
- n := len(e) + 4
- *dst = append(*dst, bytes.NewReader(asciiHex16(n)))
- *dst = append(*dst, bytes.NewReader(e))
-
- return nil
-}
-
-func checkPayloadLength(n int) error {
- switch {
- case n < 0:
- panic("unexpected negative payload length")
- case n == 0:
- return ErrEmptyPayload
- case n > MaxPayloadSize:
- return ErrPayloadTooLong
- default:
- return nil
- }
-}
-
-// Returns the hexadecimal ascii representation of the 16 less
-// significant bits of n. The length of the returned slice will always
-// be 4. Example: if n is 1234 (0x4d2), the return value will be
-// []byte{'0', '4', 'd', '2'}.
-func asciiHex16(n int) []byte {
- var ret [4]byte
- ret[0] = byteToASCIIHex(byte(n & 0xf000 >> 12))
- ret[1] = byteToASCIIHex(byte(n & 0x0f00 >> 8))
- ret[2] = byteToASCIIHex(byte(n & 0x00f0 >> 4))
- ret[3] = byteToASCIIHex(byte(n & 0x000f))
-
- return ret[:]
-}
-
-// turns a byte into its hexadecimal ascii representation. Example:
-// from 11 (0xb) to 'b'.
-func byteToASCIIHex(n byte) byte {
- if n < 10 {
- return '0' + n
- }
-
- return 'a' - 10 + n
-}
-
-// AddString adds the strings in pp as payloads of a
-// corresponding number of pktlines.
-func (p *PktLines) AddString(pp ...string) error {
- tmp := []io.Reader{p.r}
- for _, p := range pp {
- if err := addString(&tmp, p); err != nil {
- return err
- }
- }
-
- p.r = io.MultiReader(tmp...)
-
- return nil
-}
-
-func addString(dst *[]io.Reader, s string) error {
- if err := checkPayloadLength(len(s)); err != nil {
- return err
- }
-
- n := len(s) + 4
- *dst = append(*dst, bytes.NewReader(asciiHex16(n)))
- *dst = append(*dst, strings.NewReader(s))
-
- return nil
-}
-
-// Read reads the pktlines for the payloads added so far.
-func (p *PktLines) Read(b []byte) (n int, err error) {
- return p.r.Read(b)
-}